Apparatus

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sensors Mode-S transponder

A4870D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N391FR · AIRBUS A-320neo · operated by BANK OF UTAH TRUSTEE

Hex
A4870D
Octal
51103415
Decimal
10,782,477
Country
US
Tail
N391FR
Type
A20N
No current signal · last broadcast 1h ago
Flights observed
512
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A4870D.

Country allocation

The ICAO 24-bit address A4870D falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
FFT2410 - 7 2026-07-12
FFT4685 Frontier Airlines 6 2026-06-25
FFT3624 - 6 2026-06-27
FFT3021 Frontier Airlines 6 2026-06-15
FFT1746 - 6 2026-06-23
FFT1426 Frontier Airlines 6 2026-05-27
FFT1270 - 6 2026-06-15
FFT4602 - 5 2026-07-11
FFT3224 Frontier Airlines 5 2026-06-15
FFT1342 Frontier Airlines 5 2026-06-16
FFT1085 Frontier Airlines 5 2026-04-29
FFT4725 - 4 2026-06-23
FFT4401 Frontier Airlines 4 2026-05-03
FFT4076 - 4 2026-07-10
FFT3999 - 4 2026-06-16
FFT3942 - 4 2026-06-17
FFT3454 - 4 2026-07-10
FFT3453 - 4 2026-07-11
FFT3383 Frontier Airlines 4 2026-05-27
FFT3241 Frontier Airlines 4 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 FFT1545 RSW → CLE Jul 14, 00:35 UTCJul 14, 02:50 UTC2h 15m
2026-07-13 FFT1544 - Jul 13, 20:55 UTCJul 13, 23:20 UTC2h 25m
2026-07-13 FFT206 - Jul 13, 15:25 UTCJul 13, 18:35 UTC3h 10m
2026-07-13 FFT207 - Jul 13, 10:45 UTCJul 13, 13:45 UTC3h 0m
2026-07-13 FFT207 CLE → CUN Jul 13, 10:30 UTCJul 13, 13:40 UTC3h 10m
2026-07-13 FFT2184 TPA → CLE Jul 13, 02:35 UTCJul 13, 04:30 UTC1h 55m
2026-07-12 FFT1491 - Jul 12, 22:50 UTCJul 13, 01:20 UTC2h 30m
2026-07-12 FFT4118 - Jul 12, 19:55 UTCJul 12, 21:10 UTC1h 15m
2026-07-12 FFT4117 - Jul 12, 17:15 UTCJul 12, 18:25 UTC1h 10m
2026-07-12 FFT2410 - Jul 12, 14:50 UTCJul 12, 16:05 UTC1h 15m
2026-07-12 FFT2467 - Jul 12, 11:15 UTCJul 12, 12:45 UTC1h 30m
2026-07-12 FFT2184 - Jul 12, 01:45 UTCJul 12, 03:50 UTC2h 5m
2026-07-11 FFT1491 CLE → TPA Jul 11, 22:25 UTCJul 12, 00:40 UTC2h 15m
2026-07-11 FFT3073 - Jul 11, 19:35 UTCJul 11, 20:40 UTC1h 5m
2026-07-11 FFT3074 - Jul 11, 17:10 UTCJul 11, 18:10 UTC1h 0m
2026-07-11 FFT2410 ATL → CLE Jul 11, 14:30 UTCJul 11, 15:45 UTC1h 15m
2026-07-11 FFT4601 EWR → ATL Jul 11, 10:15 UTCJul 11, 12:05 UTC1h 50m
2026-07-11 FFT4602 ATL → EWR Jul 11, 05:16 UTCJul 11, 06:46 UTC1h 30m
2026-07-11 FFT4602 ATL → EWR Jul 11, 05:10 UTCJul 11, 06:50 UTC1h 40m
2026-07-11 FFT3453 - Jul 11, 01:05 UTCJul 11, 01:15 UTC10m
2026-07-10 FFT3453 LGA → ATL Jul 10, 23:52 UTCJul 11, 02:49 UTC2h 57m
2026-07-10 FFT3454 ATL → LGA Jul 10, 20:35 UTCJul 10, 22:35 UTC2h 0m
2026-07-10 FFT3454 ATL → LGA Jul 10, 19:46 UTCJul 10, 22:35 UTC2h 49m
2026-07-10 FFT4076 - Jul 10, 16:55 UTCJul 10, 18:35 UTC1h 40m
2026-07-10 FFT2399 - Jul 10, 13:00 UTCJul 10, 14:30 UTC1h 30m
2026-07-10 FFT3216 LAX → ATL Jul 10, 07:00 UTCJul 10, 10:55 UTC3h 55m
2026-07-10 FFT4082 - Jul 10, 04:00 UTCJul 10, 05:00 UTC1h 0m
2026-07-10 FFT2457 LAX → SJC Jul 10, 01:40 UTCJul 10, 02:35 UTC55m
2026-07-09 FFT3215 - Jul 9, 19:50 UTCJul 9, 23:45 UTC3h 55m
2026-07-09 FFT3215 ATL → LAX Jul 9, 19:31 UTCJul 9, 23:43 UTC4h 12m
2026-07-09 FFT1846 - Jul 9, 16:25 UTCJul 9, 17:25 UTC1h 0m
2026-07-09 FFT4771 - Jul 9, 13:50 UTCJul 9, 14:55 UTC1h 5m
2026-07-09 FFT2467 - Jul 9, 10:50 UTCJul 9, 12:10 UTC1h 20m
2026-07-09 FFT2184 TPA → CLE Jul 9, 01:55 UTCJul 9, 03:50 UTC1h 55m
2026-07-09 FFT2184 TPA → CLE Jul 9, 02:04 UTCJul 9, 03:45 UTC1h 41m
2026-07-08 FFT1491 CLE → TPA Jul 8, 22:25 UTCJul 9, 00:25 UTC2h 0m
2026-07-08 FFT3073 - Jul 8, 19:35 UTCJul 8, 20:40 UTC1h 5m
2026-07-08 FFT3074 - Jul 8, 17:15 UTCJul 8, 18:15 UTC1h 0m
2026-07-08 FFT2410 - Jul 8, 14:40 UTCJul 8, 15:50 UTC1h 10m
2026-07-08 FFT2410 ATL → CLE Jul 8, 14:12 UTCJul 8, 15:50 UTC1h 38m
2026-07-08 FFT2467 CLE → ATL Jul 8, 11:40 UTCJul 8, 13:05 UTC1h 25m
2026-07-07 FFT4118 - Jul 7, 21:35 UTCJul 7, 22:50 UTC1h 15m
2026-07-07 FFT4117 - Jul 7, 17:00 UTCJul 7, 18:15 UTC1h 15m
2026-07-07 FFT2410 ATL → CLE Jul 7, 14:12 UTCJul 7, 15:07 UTC55m
2026-07-07 FFT2410 - Jul 7, 13:55 UTCJul 7, 15:05 UTC1h 10m
2026-07-07 FFT2467 - Jul 7, 10:45 UTCJul 7, 12:05 UTC1h 20m
2026-07-07 FFT1545 - Jul 7, 03:40 UTCJul 7, 05:55 UTC2h 15m
2026-07-07 FFT1544 - Jul 7, 00:15 UTCJul 7, 02:35 UTC2h 20m
2026-07-06 FFT2410 ATL → CLE Jul 6, 15:00 UTCJul 6, 16:10 UTC1h 10m
2026-07-06 FFT3453 LGA → ATL Jul 6, 05:40 UTCJul 6, 07:30 UTC1h 50m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N391FR page for operator, model, and routing details .

Mode-S A4870D frequently asked

What is Mode-S code A4870D?
A4870D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N391FR.
Where is Mode-S A4870D registered?
Mode-S code A4870D is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A4870D broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4870D, octal 51103415, decimal 10,782,477.
What flights does A4870D operate?
Mode-S A4870D has broadcast 20 distinct callsigns, including FFT2410, FFT4685, FFT3624, FFT3021, FFT1746.